Programmable inverse time delay circuit

Details Programmable inverse time delay circuit Programmable inverse time delay circuit

H - Electricity

01

H

H01H 77/10 (2006.01) G06J 1/00 (2006.01) H01H 83/10 (2006.01) H02H 3/00 (2006.01) H02H 3/027 (2006.01)

Patent

CA 2046077

55,967 ABSTRACT OF THE DISCLOSURE An inverse time delay circuit includes an integrator for receiving a signal representative of a voltage or current in an external circuit and a reference signal. The integrator produces a control signal repre- sentative of the integral of the difference between the signals. A comparator compares the control signal to a second reference signal to produce an output which changes logic states when the magnitude of the control signals exceeds the magnitude of the second reference signal. A circuit is provided to control the magnitudes of one or both of the reference signals thereby providing control of the instantaneous and/or ultimate trip levels of the circuit.

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